轻组分向上流至催化剂段，在那里丁二烯选择性加氢、脱硫和一些烯烃的饱和同时进行。
The light constituents flow upward to the catalyst zone, where the selective hydrogenation of butadiene is carried out together with desulfurization and some olefin saturation.
轻组分向上流至催化剂段，在那里丁二烯选择性加氢、脱硫和一些烯烃的饱和同时进行。
The light constituents flow upward to the catalyst zone, where the selective hydrogenation of butadiene is carried out together with desulfurization and some olefin saturation.
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